Improvement in governors and cut-offs for steam-engines



- M. IDfMILLER. GOVERNOR AND CUT'0FF FOR STEAM-ENGINES.

Patented Nov. 9,1875.

m m n o T T A NIPETERS, PHOTO-LITNOGRAFHER, WASHINGTON. D C.

- section on line tive motion.

UNITED STATES PATENT O FICE.

MARTIN D. MILLER, OF OSWEGO, KANSAS, ASSIGNOR TO HIMSELF AND JAMES T.PIERSON, OF SAME PLACE.

IMPROVEMENT IN GOVERNORS AND CUT-OFFS FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 169,719, dated November9, 1875; application filed July 31, 1875.

To all whom it may concern Be it known that I, MARTIN D. MILLER, ofOswego, in the county of Labette and State of Kansas, have invented anew and Improved Governor and Gut-Off for Steam-Engines, of which thefollowing is a specification The invention will first be described inconnection with drawing, and then pointed out in the claims.

Figure 1 is a sectional elevation of my improved governor, taken on linem a: of Fig. 2. Fig. 2 is a top view. Fig. 3 is a horizontal y y of Fig.l, and Fig. at is a section on line 2' z.

Similar letters of reference indicate corresponding parts.

A is the hollow revolving and reciprocating cylindrical valve, havingspiral ports B, and arranged in the stationary case 0, having spiralports D, through which steam is admitted from pipe E, to pass downthrough F into the steam-chest containing the ordinary slidevalve. Thestem of this valve is geared by wheel G with the long pinion H, and itis also swiveled to the toothed rack I, the formergiving rotary and thelatter reciprocating motion. The long pinion is geared by the eccentricwheels J to the driver, connected with the engine, and worked by a chainto give posi- The governor-spimlle passes through a concave or dishedplate, Q, which is secured to the frame-work of the governor by a screw,V. To the upper end of the governor-spindle is attached a horizontalframe or wheel, T,

which carries spindles S, rollers R, springs U, and screws W. I

The rollers R move upon the concave plate Q, and operate in such amanner that when the engine is running at regular speed the wheel Lisheld disengaged from the wheel M 5 but upon the least change of motionof the.

engine from load or steam pressure, the rollers R and governor-shaftwill be raised or lowered, thus causing the wheel M to engage Thetoothed rack gears with the with the wheel L for raising or lowering thevalve; by this means regulating the closing of said valve, according tothe pressure required to again bring the engine to speed, when the wheelM again resumes its disengaged position. i The springs U encircle thespindles S, and are adjusted to vary the force with which they act onthe rollers by the ad justing-screws W.

The weight of the valve A and its adjuncts is counterbalanced by theweighted lever X, to enable the governor to have the same effect in bothdirections. The valve A is geared to be opened with the commencementofthe stroke of the engine. The eccentric wheels, by their irreguarmotion, allow it to remain open th reequarters of the stroke, and insurethe opening of it after the slide-valve has closed. closing of valve Ais regulated by the governor, and may be caused to close and cut off atone-eighth or three-quarters of the stroke. By giving it slow motion bythe eccentric wheels while open, the slide-valve is permitted to closebefore valve A opens. Thus the opening of the ports of said valve nevertakes place until slide-valve has closed; but it closes at any pointfrom one-eighth to three-quarters of the stroke of the engine.

' Having thus described my invention, I claim as new and desire tosecure by Letters Patent-- l. The disengaging friction wheel, incombination with valve and easing, the weight of valve and fittingsbeing balanced by ball and lever, as set forth, to enable the governorto regulate the speed with accuracy.

2. The rotary hollow valve A, having spiral ports, in combination \vithacase havingspiral ports, the said valve having its weightcounterbalanced, and being geared with the governor-pinion K by atoothed rack, I, substantially as specified.

3. The combination, in a governor, of concave plate Q, rollers R,spindles S, springs U, and adjustingscrews W, substantially in themanner described.

MARTIN D. MILLER. Witnesses:

JOHN HAMBLIN, GEO. OROUsE.

The

